NAME

SYNOPSIS

DESCRIPTION

The pthread_sigmask() function examines and/or changes the calling
thread's signal mask.
If set is not NULL, it specifies a set of signals to be modified, and how
specifies what to set the signal mask to:
SIG_BLOCK Union of the current mask and set.
SIG_UNBLOCK Intersection of the current mask and the complement of set.
SIG_SETMASK set.
If oset is not NULL, the previous signal mask is stored in the location
pointed to by oset.
SIGKILL and SIGSTOP cannot be blocked, and will be silently ignored if
included in the signal mask.